Time for the engine builders to chime in.

[slow_yota]

Pulled a motor from the yard today, Ran when I pulled it.
Started taking it apart for a rebuild and found something weird, The first two are the "damaged" pistons...the last is a non "damaged" one.....

Any ideas on why or how this happened, Obviously it wasn't that bad to kill the engine....Just seems weird. Only thing I could even imagine is that it had a bad injector or plug and was detonating pretty bad.Its just that the markings are so odd looking.

 

[Poodles]

Someone scrapped the carbon deposits off with something sharp.

 

[slow_yota]

Oh Is that it?...lol, Thought it would be way more interesting than that!
I could see that though.

 

[Poodles]

Yeah, you're not really supposed to use anything sharp. Supposed to use solvent and a brush.

 

[hvyman]

Tranny fluid will take it off pretty good too if you let it sit there for a day or 2.

 

[slow_yota]

Must of been taken apart at some point and scraped up then, I used brake cleaner and a dish scrubber.
Doesn't really matter since I'm going with new...But was curious still the same.